Design Choice 1: Single vs. multiple embeddings for a single user.
Most approaches to generating user representations produce a single embedding [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, but some focus on learning a fixed or variable number of user embeddings [8]}, [9]}, [10]}, [11]}.
In our previous user representation, PinnerSage, we made the decision to allow for a variable, potentially large number of embeddings, allowing the model to explicitly represent a user's varied interests [9]}.
